You can find some old brass lenses (especially in barrel) for <$10 often times.

Because no one that I'm aware of locally has any barrel/Petval lenses (I check various antique, photo, and thrift stores periodically, and have never seen one). This means I'd have to buy one from someone online, pay for shipping and possibly duty, etc. Likely more than $1 I spent on this magnifying glass

Also, I intended to use this beater Graphic with a pinhole, and so I really don't have a lens a mind, but I thought for $1 and some time I could play around a bit.

i can't wait to take a picture of my thumb with this beautiful camera.